[chunk71]

Originally Posted by cami134 | View Post » Thanks, so in a way 19 episodes in all, the 1st and 2nd episodes are combined with the same title.

Yes. If you look here for the DVD/Blu-Ray press release you'll see a bit further down that Universal say 18 episodes.
Heroes DVD news: Press Release for Heroes - Season 4 | TVShowsOnDVD.com